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setup-sbt installs the official sbt runner

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Setup sbt
=========

This action enables `sbt` runner from GitHub Actions.

Usage
-----

Here's an example usage of setup-sbt action.

```yaml
env:
  JAVA_OPTS: -Xms2048M -Xmx2048M -Xss6M -XX:ReservedCodeCacheSize=256M -Dfile.encoding=UTF-8
steps:
- uses: actions/checkout@v6
- name: Setup JDK
  uses: actions/setup-java@v5
  with:
    distribution: temurin
    java-version: 17
    cache: sbt
- uses: sbt/setup-sbt@v1
- name: Build and test
  shell: bash
  run: sbt -v +test
```

`uses: sbt/setup-sbt@v1` makes `sbt` available on Linux, macOS, and Windows.

### Setting the runner version

The `sbt` runner is typically compatible with all modern sbt releases.
In the future, the launcher distributed by sbt 2.x may require JDK 17.

You can pin the `sbt` runner back to sbt 1.x to run JDK 8:

```yaml
env:
  JAVA_OPTS: -Xms2048M -Xmx2048M -Xss6M -XX:ReservedCodeCacheSize=256M -Dfile.encoding=UTF-8
steps:
- uses: actions/checkout@v6
- name: Setup JDK
  uses: actions/setup-java@v5
  with:
    distribution: zulu
    java-version: 8
    cache: sbt
- uses: sbt/setup-sbt@v1
  with:
    sbt-runner-version: 1.12.11
- name: Build and test
  shell: bash
  run: sbt -v +test
```

### Opting out of disk cache

By default setup-sbt enables the disk cache on sbt 2.x. This can be opted out as follows:

```yaml
- uses: sbt/setup-sbt@v1
  with:
    disk-cache: false
- name: Build and test
  shell: bash
  run: sbt -v +test
```

Why is this GitHub Action needed?
---------------------------------

The runner images on GitHub Action had long included `sbt` runner script. The [initial commit on actions/runner-images](https://github.com/actions/runner-images/pull/96) contains `images/linux/scripts/installers/sbt.sh`

### May 2024

However, the situation has changed in May 2024 when GitHub released the runner image for `macos-13` and `macos-14`, users noticed that they were missing the `sbt` runner script.

[actions/runner-images#9369](https://github.com/actions/runner-images/issues/9369) and [actions/runner-images#9837](https://github.com/actions/runner-images/issues/9837) confirmed that this was intentional:

> Thank you for such detail request. But currently we have no plans to add `sbt` on `macOS-13`/`macOS-14`.

Since GitHub Actions are extensible, we thought this providing a setup action would be convenient way to enable `sbt` again on all runner images.

### December 2024

The situation changed again in December 2024 when GitHub dropped sbt from `ubuntu-latest`. So now this same action is needed for Ubuntu-based builds, too.

License
-------

The scripts and documentation in this project are released under the [MIT License](LICENSE).

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